Gradenigo's syndrome

Common in diabetics, patients on high-dose steroids, and immunosuppressed individuals (e.g. HIV/AIDS).

About Gradenigo's Syndrome

• Gradenigo's Syndrome is a rare neurological condition characterized by the classic triad of:
  • Suppurative otitis media
  • Trigeminal nerve pain (usually V1 distribution)
  • Abducens (CN VI) nerve palsy
• First described by Giuseppe Gradenigo in 1907.
• Results from infection spreading to the petrous apex of the temporal bone, affecting adjacent cranial nerves.

🧬 Aetiology

Usually secondary to untreated or chronic suppurative otitis media, with infection spreading to the petrous apex → apical petrositis.

• Petrous Apex Involvement: infection/inflammation involving trigeminal ganglion (CN V) and abducens nerve (CN VI).
• Occasional extension: to optic nerve (CN II) or other skull base cranial nerves.

🩺 Clinical Features

• Ear Symptoms: chronic/recurrent otitis media, otorrhea, hearing loss.
• Facial Pain: trigeminal neuralgia-like pain in forehead/eye (V1 distribution).
• Diplopia: due to abducens palsy (lateral rectus weakness).
• Systemic features: fever, malaise if acute infection ongoing.

Complications if Untreated

• Meningitis or brain abscess.
• Spread to skull base cranial nerves IX, X, XI → dysphagia, hoarseness, shoulder weakness.
• Parapharyngeal or prevertebral abscess → airway compromise.
• Sympathetic plexus involvement → Horner’s syndrome (ptosis, miosis, anhidrosis).

Differential Diagnoses

• Cavernous sinus thrombosis (infective, multiple cranial nerves).
• Tolosa-Hunt syndrome (granulomatous inflammation, steroid responsive).
• Carotid aneurysm/dissection.
• Skull base tumours/metastases.
• Multiple sclerosis or other demyelinating lesions.
• Herpes zoster ophthalmicus.

🔎 Investigations

• Bloods: FBC, U&E, LFTs, CRP, ESR.
• Microbiology: Ear swabs/CSF cultures if meningitis suspected.
• Imaging:
  • MRI/CT petrous temporal bone: key to show apical petrositis, bone erosion, inflammation.
  • MR venography: if cavernous sinus thrombosis suspected.
• CSF analysis: if meningitis suspected.

💊 Management

Unlike Tolosa-Hunt, steroids are not primary therapy. Management is infection-focused.

• Antibiotics: IV broad-spectrum antibiotics (covering Gram-positive, Gram-negative, anaerobes) tailored to cultures.
• Surgical intervention: mastoidectomy or apical petrosectomy if abscess or persistent disease.
• Adjunctive steroids: occasionally used to reduce inflammation alongside antibiotics, but not first-line alone.
• Supportive: analgesia, physiotherapy for ophthalmoplegia, seizure management if intracranial spread.

Prognosis

• Favourable if diagnosed early and treated with antibiotics ± surgery.
• Delay risks meningitis, intracranial abscess, and long-term cranial nerve palsies.

Conclusion

Gradenigo’s Syndrome is a rare but serious complication of otitis media. It should be suspected in patients with ear infection, trigeminal neuralgia-like pain, and abducens palsy. Early imaging and antibiotics are lifesaving; steroids only play a limited adjunctive role.

References

• Gradenigo G. Il neurologo in facoltà otorinolaringoiatrica. 1907.
• De Angelis F, et al. Clinical characteristics and outcomes of Gradenigo's syndrome. J Neurol Neurosurg Psychiatry. 2012;83(5):525-528.
• Wolff SM, et al. Gradenigo’s Syndrome: A case report and literature review. Neurol India. 2012;60(2):252-254.
• Osborn AG. Diagnostic Imaging: Brain. Elsevier; 2015.